RU194003U1 - DEVICE FOR TIGHTENING A NUT - Google Patents

Abstract

The utility model relates to the field of aircraft engineering and can be used for assembly and repair of a rotary swashplate of a helicopter rotor for carrying out a technological operation of tightening and loosening a swashplate nut. The device for tightening the nut of the swashplate of the helicopter contains a support (1). The support (1) consists of a housing (12) with a flange (13) in which grooves (14) are made, and rods (23) with clamped spherical washers (24) and nuts (25) are fixed on the housing. A torque sensor (2) is attached to the support (1), connected to the output device (3). A flange is attached to the sensor, which is detachably connected to the adapter (6) through a prism. The adapter (6) is made in the form of a pipe, and caps (29) with prismatic holes (30) made in them are installed on the ends of the housing (26). A gear ring (8) is installed on the splice housing (7) on the slots, consisting of a housing (9) and a replaceable ring gear (10), and a torque wrench (11) is installed on top of the input shaft of the multiplier (7). Improving the accuracy of measurements and control tightening torque, simplification of maintenance, reduction of staff load. 2 s.p. f-ly, 7 ill.

Description

The utility model relates to the field of aircraft manufacturing and can be used for assembly and repair of a rotary swashplate of a helicopter rotor for carrying out a technological operation of tightening and loosening a swashplate nut.

A known key for tightening the nut of the rotor rotor sleeve of the helicopter (application RU 2003127193, ВВВ 17/02, publ. March 10, 2005), comprising a cylindrical case with a cap bolted to the case, a two-stage transmission with a shaft as a drive, an input shaft, fixed on the cover, bearing bearings of rotation, a plate with profiled cutouts for eye bolts, spline coupling. At the same time, a device with an offset drive is made in the device for transmitting and amplifying torque from the drive tool.

Also known is a device for disassembling and assembling a rotor hub of a helicopter closest to the claimed solution (patent CN 205521206 U, B25B 27/14, publ. 08/31/2016), which contains a working element in the form of a pipe, a multiplier, as a means for torque amplification, torque wrench with a reverse stroke of the handle, the sleeve. In the process of using the device for disassembling the rotor hub, first remove the safety nut, unscrew the fixing screw. Fix the sleeve on the mounting nut, connect the multiplier, combining the square head of the multiplier and the square groove in the upper part of the sleeve. Unscrew the nut.

Known devices have a limited scope for specific technological operations; weaknesses include poor control over the accuracy of the nut tightening operation.

A technical problem that has not been solved in the known devices, the solution of which is provided by the claimed utility model, is to create a device for manually tightening the nut of the swash plate without the application of large forces, as well as observing the accuracy of measurements and monitoring the tightening torque in accordance with the requirements of GOST R 50271-92.

The technical result consists in increasing the accuracy of measurements and monitoring the tightening torque, simplifying maintenance, and reducing the burden on personnel.

The technical result is achieved due to the fact that in the device for tightening the nut of the swashplate of the helicopter containing a support and an adapter with a multiplier installed on it, a torque wrench is installed on its input shaft, in accordance with the claimed utility model, the support consists of a housing with a flange, in which grooves are made, and rods with clamping spherical washers and nuts are fixed on the housing, a torque sensor connected to the output device is fixed to the support, a flange is fixed to the sensor , which is detachably connected through a prism to the adapter, the adapter being made in the form of a pipe, on the ends of which are mounted caps with prismatic holes made in them, a gear ring consisting of a housing and a replaceable gear ring is installed on the splines of the multiplier on top of the input shaft Multiplier mounted torque wrench.

In addition, a digital display was used as the output device.

There is an option in which a computer is used as the output device.

The use of a support, which consists of a housing with a flange in which grooves are made, and rods with clamping spherical washers and nuts are fixed on the housing, a torque sensor connected to the output device is fixed to the support, an adapter is installed on the sensor through a flange with a prism, while the adapter is made in the form of a pipe, a multiplier is installed on the adapter, and a gear ring is installed on the splice case on the splines, consisting of a housing and a replaceable gear ring, on top of the input shaft of the multiplier a torque wrench is installed - it is aimed at improving the accuracy of measurements and monitoring the tightening torque, simplifying maintenance, and reducing the burden on personnel.

The use of a sensor mounted on a support and connected to the output device significantly increases the accuracy of measurements.

The device for tightening the nut of the swashplate of the helicopter is illustrated by the drawings:

FIG. 1 - Device for tightening the nut, front view;

FIG. 2 - Device for tightening the nut, top view;

FIG. 3 - Support, front view;

FIG. 4 - Support, top view;

FIG. 5 - Adapter, front view;

FIG. 6 - Adapter, top view;

FIG. 7 - A device for tightening a nut with an installed swash plate.

The device for tightening the nut of the swashplate of the helicopter consists of a support 1, designed to install and fix the swashplate on the device on which the torque sensor 2 is connected, connected to the output device 3, for example, a digital display or computer (Fig. 1). A flange 4 is mounted on the sensor 2. A flange 4 is detachably connected through a prism 5 to an adapter (extension cord) 6, designed to transmit torque from the multiplier 7 to the torque sensor 2. On the adapter 6, a multiplier 7 is mounted on the adapter shaft for transmission and gain torque. A gear rim 8 consisting of a housing 9 and a replaceable gear rim 10 is detachably mounted on the multiplier housing 7 on the slots. A torque wrench 11 is installed on top of the input shaft of the multiplier 7.

The support 1 consists of a housing 12, which has a flange 13 with grooves 14, in which bolts 15 are installed, designed to fix the device (Fig. 3, 4). In the upper part of the housing 12 there are threaded holes 16, into which bolts 17 are screwed in to fix the slider of the swash plate on the device, there are also threaded holes 18 for fastening the torque sensor 2.

The bracket 19 with bolts 20 and bolts 21 is fastened to the housing 12 with bolts, designed to fix the bracket of the common step with a swashplate. Cantilever axles (pins) 22 are installed on the housing 12, on which rods 23 are installed with self-aligning clamping spherical washers 24 and nuts 25, designed to fix and hold the control levers of the swash plate when tightening.

The adapter 6, consists of a housing 26 made on the basis of a metal pipe of circular cross section, at the ends of which grooves 27 are made (Fig. 5, 6). The dowels 28 are installed in the slots 27. The covers 29 are installed on the ends of the housing 26 with prismatic holes 30 made in them, intended for connection with the response prisms on the multiplier 7 and the prism 5 mounted on the torque sensor 2. The covers 29 are fixed with screws 31. The outer surfaces of the adapter 6 are covered with felt pads 32 that protect the parts by the swash plate from damage at the time of installation of the adapter 6 on the device.

The use of the sensor 2, connected to the output device 3, allows you to control the true torque without taking into account the errors of the multiplier 7, which significantly increases the accuracy of the measurements. As the output device 3, a digital display may be used to display the torque value.

You can also use the computer as an output device 3, which allows you to save and analyze data.

A device for tightening the nut of the swashplate of a helicopter works as follows.

The swashplate is installed and fixed on the support 1, securing the slider of the swashplate with bolts 17 in the holes 16 (Fig. 7), the common-pitch bracket is installed and fixed on the bracket 19 with latches 20 and bolts 21, the control levers of the swashplate are held by rods 23 and fixed by washers 24 and nuts 25.

Tightening / loosening occurs when the torque wrench 11 is rotated, while the multiplier 7 amplifies and transfers the torque to the adapter 6 and then through the prism 5 and flange 4 to the torque sensor 2. Since the torque sensor 2 is rigidly fixed to the support 1, then the case of the multiplier 7 there is a reactive torque equal in magnitude and opposite in direction, which is transmitted to the ring gear 8, and then to the tightened / unscrewed nut of the swash plate. Since the swashplate is fixed on the support 1, the output moment of the multiplier and the reactive moment are in equilibrium, the system is closed. The torque sensor 2 takes the torque value, and for convenience it is output to the output device 3. Due to the fact that tightening / loosening occurs by reactive torque, the rotation of the key 11 is performed in the opposite direction with respect to the rotation of the tightened / unscrewed nut.

It is possible to use the device without a torque sensor 3, while the torque is controlled by a torque wrench 11 and calculated according to the tables given in the instructions for the multiplier, or formulas based on the gear ratios of the multiplier 7.

The proposed device is characterized by small dimensions, high accuracy (± 0.5 ... 1%), high reliability, ease of use.

The device allows you to tighten or unscrew the nut in one installation, without additional manipulations.

Claims (3)

1. A device for tightening the nut of a swashplate of a helicopter, containing a support and an adapter with a multiplier mounted on it, on the input shaft of which a torque wrench is installed, characterized in that the support consists of a housing with a flange in which grooves are made, and thrusts are fixed to the housing with clamping spherical washers and nuts, a torque sensor connected to the output device is fixed to the support, a flange is attached to the sensor, which is detachably connected to the adapter through a prism, while the adapter Execute a tube, the ends of which are installed with a cover made therein prismatic holes, the housing multiplier splined toothing is mounted, consisting of a housing and a replaceable toothed crown on top of the input shaft of the multiplier is set torque wrench. 2. The device according to claim 1, characterized in that a digital display is used as the output device. 3. The device according to claim 1, characterized in that a computer is used as the output device.

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